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Xueyang Zeng, Gang Chen, Huabo Shi, Sijia Wang and Peng Shi
Aiming at the problem of ultra-low-frequency oscillation (ULFO) in power systems, with an oscillation frequency lower than 0.1 Hz, an oscillation suppression control method is proposed. Firstly, the mathematical modeling of the system is carried out, and...
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Huan Wang, Erzheng Fang, Mingze Wu, Lianjin Hong and Zongru Li
When an underwater target moves in viscous fluid, it may cause the periodic movement of the surrounding fluid and generate ultra-low-frequency (ULF) gravity waves. The initial domain of the gravitational surface wave propagating above the moving target i...
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Guowei Cai, Xiangsong Chen, Zhenglong Sun, Deyou Yang, Cheng Liu and Haobo Li
Using a doubly-fed induction generator (DFIG), with an additional active or reactive damping controller, is a new method of suppressing the inter-area oscillation of a power system. However, using active power modulation (APM) may decrease the damping of...
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Yanfeng Ma, Jia Liu, Haihang Liu and Shuqiang Zhao
Large-scale wind power interfacing to the power grid has an impact on the stability of the power system. However, with an additional damping controller of the wind generator, new ways for improving system damping and suppressing the low frequency oscilla...
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Wenping Hu, Jifeng Liang, Yitao Jin, Fuzhang Wu, Xiaowei Wang and Ersong Chen
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Jin Tan, Weihao Hu, Xiaoru Wang and Zhe Chen
This paper describes a frequency domain approach for evaluating the impact of tower shadow and wind shear effects (TSWS) on tie-line power oscillations. A simplified frequency domain model of an interconnected power system with a wind farm is developed. ...
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Yuepeng Yan, Xiaoqiang Fan and Bing Xiong
Experiments were conducted in this study to reveal the flow characteristics of a variable cross-section S-shaped isolator, when applying the steady-state back pressure at the isolator outlet. The self-excited oscillation characteristics of the shock trai...
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Akira Iwakawa, Tatsuro Shoda, Hoang Son Pham, Takahiro Tamba and Akihiro Sasoh
The effect of repetitive energy deposition on low Strouhal number oscillations of the shock wave induced by boundary-layer interaction over a cylinder-flare model was studied. The fluctuation of the energy deposition frequency was induced in the flow, be...
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HAIKUN ZHAO,GRACIELA B. RAGA
Pág. 353 - 365
This study attempts to understand why the frequency of tropical cyclones (TC) over the western North Pacific (WNP) was a record low during the 2010 season, by analyzing the effect of several large-scale factors. The genesis potential index (GPI) can repr...
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Krassimir Panajotov and Richard Schatz
VCSELs are widely employed in Fiber to the Home links, computer networks and optical interconnects because of their low power consumption, small footprint, high reliability, easy packaging, single longitudinal mode emission, high modulation speed, low co...
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Yu. Ya. Vodiannikov,L. S. Olhard,O. V. Hrechko
Pág. 141 - 147
The article presents the results of study of the interaction processes of a brake shoe and a wagon on the level ground and a 30 ? bias during braking operation. The static characteristics of the axial forces, acting upon the brake shoe, as well as their ...
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R. PRIETO,R. HERRERA,P. DOUSSEL,L. GIMENO,P. RIBERA,R. GARCÍA,E. HERNÁNDEZ
Documental sources and categorization techniques were used to construct a series of the annual hail intensity in Mendoza area (Argentina). When the temporal series by means of Singular Spectrum Analysis (SSA) and the Maximum Entropy Method (MEM) was a...
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Matthew Baird, Thomas Kerber, Ron McGee-Sinclair and Kristina Lemmer
Hall effect thrusters (HETs) are an increasingly utilized proportion of electric propulsion devices due to their high thrust-to-power ratio. To enable an accessible research thruster, our team used inexpensive materials and simplified structures to fabri...
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Yunxia Guo, Dongxue Mo and Yijun Hou
The Yellow Sea cold water mass (YSCWM) occupies a wide region below the Yellow Sea (YS) thermocline in summer which is the most conservative water and may contain clearer climate signals than any other water masses in the YS. This study investigated the ...
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Chatrpol Pakasiri, Ke-Chung Hsu and Sen Wang
In this paper, a wideband VCO that covers popular Long-Term Evolution (LTE) 0.7 GHz and LTE 2.6 GHz frequencies is designed and developed in a standard 0.18 µm CMOS process. The VCO utilizes active inductors to achieve coarse-tuning of the inductance and...
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Jinrong Bao, Chenzhen Ji, Deng Pan, Chao Zong, Ziyang Zhang and Tong Zhu
The propagation mechanism of flow disturbance under acoustic excitations plays a crucial role in thermoacoustic instability, especially when considering the effect of non-premixed combustion on heat release due to reactant mixing and diffusion. This rela...
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Yu Tian, Luofeng Wang, Zhongliang Zhou and Renliang Chen
In order to reveal the mechanism of Category II rotor-body-slung-load coupled oscillation (RBSLCO) with the frequency range of 2.5~8 Hz, a novel nonlinear rigid-elastic coupled model is presented for the helicopter and slung load system (HSLS) with expli...
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Yuwei Cheng, Qian Chen, Xiaofei Niu and Shufeng Cai
Supersonic combustion instability studies are crucial for the future maturation of scramjet engines. In the present paper, the supersonic combustion instability in a strut-based scramjet combustor is investigated through large eddy simulation and dynamic...
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Yuzhou Wang, Ali Matin Nazar, Jiajun Wang, Kequan Xia, Delin Wang, Xiaosheng Ji and Pengcheng Jiao
Triboelectric nanogenerators (TENG), which convert mechanical energy (such as ocean waves) from the surrounding environment into electrical energy, have been identified as a green energy alternative for addressing the environmental issues resulting from ...
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Zhiping He, Guofeng Wang, Yunsheng Fan and Shuanghu Qiao
This paper studies the fast finite-time path following of underactuated unmanned surface vehicles (USV) with sideslip compensation, time-varying disturbances and input saturation. In the guidance module, the fast finite-time predictor-based line-of-sight...
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